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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
24/y = 0.5 // - 0.5
24/y-0.5 = 0
24*y^-1 = 0.5 // : 24
y^-1 = 0.02083333
-1 < 0
1/(y^1) = 0.02083333 // * y^1
1 = 0.02083333*y^1 // : 0.02083333
48.00000768 = y^1
y = 48.00000768
y = 48.00000768
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